| 摘要 |
<p>An ultrafine particulate zinc oxide has a low coagulation of primary particles, can be extremely easily dispersed or suspended in an aqueous solvent without passing through a grinding process or after slight dry grinding, is advantageously used as a cosmetic material, for example, and exhibits both transparency and ultraviolet-shielding ability. A process for producing the zinc oxide and a cosmetic material containing the same are provided. The ultrafine particulate zinc oxide has a specific surface area of 10 to 200 m<2>/g determined by the single-point BET technique and a substantially isotropic primary particle shape, wherein the specific volume determined by a tapping machine is 4 to 40 m l /g, and additionally a process for producing the ultrafine particulate zinc oxide, a silica-coated ultrafine particulate zinc oxide powder and a cosmetic material using the zinc oxide powder.</p> |
